package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import io.netty.util.internal.ObjectUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.ObjectUtils;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
    //微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatProperties weChatProperties;


    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //1.根据code获取openid
        String openid = getOpenid(userLoginDTO.getCode());
        //2.判断openid是否为空 空 -> 登录失败
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //3.判断当前用户是否为新用户
        User user = userMapper.getOpenidByCode(openid);

        //4.新用户，自动完成注册, openid ,createTime
        if (ObjectUtils.isEmpty(user)) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            //插入数据库
            userMapper.insert(user);
        }
        //5.返回这个用户对象
        return user;
    }

    /**
     * 调用微信接口服务，获取微信用户的openid
     * @param code
     * @return
     */
    private String getOpenid(String code) {
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);  //用户登录凭证code
        map.put("grant_type", "authorization_code");
        //调用微信接口服务,使用 HttpClientUtil.doGet() 方法向微信接口发送 GET 请求
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        //解析
        JSONObject jsonObject = JSON.parseObject(json);
        //获取String类型openid
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
